5x + 4y = 8 ------- eq (i)

20x + 16y = 0 ----- eq (ii)

5x + 4y = 0 ------- Dividing eq (ii) by 4 ------ eq (iii)

Now look at eqs (iii) & (i). When you SUBTRACT one from the other, what do you get? This will determine your answer.

OR

Just find each slope and compare them! 

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